CN101398734A - Infrared touch screen parallel scanning system using polarizing disc - Google Patents
Infrared touch screen parallel scanning system using polarizing disc Download PDFInfo
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Abstract
A parallel scanning system of an infrared touch screen which uses polaroid sheets comprises an infrared element, infrared filter windows, corresponding drive circuits and corresponding signal processing circuits as well as a microcontroller system. The invention is characterized in that the infrared element is divided into a plurality of modules that are numbered; the infrared filter windows in front of each module are internally provided with the polaroid sheets with the same polaroid direction; the polaroid directions of the polaroid sheets in front of two neighboring modules on the same frame are reverse; the drive circuits in each module are the same; the input ends thereof after being connected in parallel are connected with the output ends of the address drive data of the microprocessor system; the module also comprises an infrared signal processing circuit; the detection signal output end of the infrared signal processing circuit is connected with the microprocessor system through a group symbol coder or directly connected with the microprocessor system. The invention divides the touch screen into a plurality of detection areas of small areas and carries out detection, thereby extensively improving the response speed of the touch screen. Besides, as the structures of the modules are the same, the design, manufacture and maintenance costs of the touch screen are reduced.
Description
Technical field
The present invention relates to the light path of infrared scan detection system in a kind of infrared touch panel and the improvement project of circuit structure, belong to the touch screen technology field in the Computer Multimedia Technology.
Technical background
In existing infrared touch panel, scanning detection mode for the touch objects of detected surface, all be to use one group to be installed in infrared transmitting tube array on the infrared touch panel frame and the infrared receiving tube array corresponding with it, by logical circuit and mimic channel, the scan address information that micro controller system produced by touch-screen inside drives in proper order, each is realized being used for the ultrared of senses touch thing and transmit and receive to infrared emission with receive pipe in the gating array.
Because prior art all is to drive and the gating infrared components in single-cycle mode in a certain order, be about to all infrared emission and receive pipe is all scanned after one time, just begin the scanning of next cycle, therefore exist long shortcoming of scan period, cause the response ratio of touch-screen slower, especially for touch-screens larger-size as 60,70 inches, the people that allows slowly of its speed is difficult to bear.Also have horizontal and vertical infrared components is separated the also mode of line scanning, also can only be shortened about half sweep time, can not fundamentally shorten cycle, the raising response speed of scanning, still be difficult to reach the requirement of actual use.At present up-to-date technical scheme such as application number are 200610140874.2 Chinese patent application, disclose a kind of utilization and followed the tracks of touch objects, the mode of carrying out partial sweep in certain zone at touch objects place improves the method for response speed, improves the response speed of touch-screen to a certain extent.But in initial searching touch objects, after perhaps touch objects is left, still want first full screen scanning to find after the touch objects midway, could in less zone, follow the tracks of touch objects, reach higher sweep velocity.Therefore, exist when initial response speed very slow problem still.
Summary of the invention
Content of the present invention is exactly at the deficiencies in the prior art part, discloses the technical scheme that a kind of parallel scanning system that uses polaroid improves infrared touch screen response speed.
Parallel scanning system of the present invention, include the infrared components that is installed on the printed circuit board (PCB) that constitutes the touch-screen framework, the infrared filtering window that is installed in infrared components light-emitting area and sensitive surface the place ahead, and the driving corresponding with infrared components and signal processing circuit, micro controller system.Compared with prior art, used folk prescription to separate the light path of concurrent working simultaneously to opposite polaroid among the present invention, cooperate again with and the circuit structure that detects of line scanning, the area dividing that is scanned detection is become the littler plurality of sub-regions of area, to reach raising sweep velocity/and then improve the purpose of response speed.Concrete technical scheme is as follows: described infrared emission and reception are divided into plurality of module to pipe and are numbered, and the identical polaroid in polarization direction all is installed in the infrared filtering window in each module the place ahead; The polarization direction of the polaroid in adjacent two module the place aheads is opposite on the same frame; The address driving circuit of each group infrared transmitting tube and receiving tube is all chosen according to same mode, time and order and is driven each to infrared components, and after the end parallel connection of the same name of the data input pin of its driving circuit, all be connected, solved each grouping or be called the problem of the parallel emission of module with the address driving data output terminal of described micro controller system.For with the corresponding receiving unit of radiating portion, in order to distinguish which group the detected output of touch signal is arranged, the signal processing circuit that all includes one infrared receiver component in described each module, and described circuit all has at least one detection signal output terminal, is connected with the I/O interface of micro controller system.
According to top basic technical scheme, various piece can further provide more detailed technology contents.In the present invention, described polaroid can be installed on the light transmitting surface of infrared absorption filter striation; The drive output of described micro controller system and the data input pin of described driving circuit can be the parallel ports that is connected by many address date lines; It also can be the serial port that is connected by an address date line.If use described serial port, then in the address date output port of described micro controller system, include a shift register of incorporating into/going here and there out, the input end of register is connected with many micro controller I/O port, its output terminal is the drive output of micro controller system, is connected with described address date line; The inside of described driving circuit includes one and seals in/and go out shift register, and its input end is connected with described address date line, and the input end of the decoding circuit in its output terminal and the described driving circuit is connected.
In the present invention, for I/O port that reduce to save micro controller system and and each module between connecting line, a group id scrambler can be set in described micro controller system, its output terminal is connected with micro controller I/O interface; Detection signal output terminal in described each module is connected with an input end of described group id scrambler respectively.Here, the group id encoder packet contains some input ends of being numbered, and is corresponding with the numbering of coupled each module of described detection signal output terminal respectively; The output terminal of described group id scrambler includes many parallel binary data lines; When certain input end is imported the signal of regulation, its output of binary data output terminal and the unique corresponding binary data of this input end.General small-scale logic chip 40147 is the scramblers that can directly use, and perhaps can be used as the reference of design.
Said structure can realize digital form detection signal output and tell which group and exported detection signal, can satisfy the needs of general infrared touch panel.But the photo-electric signal receiving circuit in each module is exported simulating signal if desired, other circuit for micro controller system carry out subsequent treatment, as obtaining higher resolution etc. after the A/D conversion, also include a totalizer in the then described parallel scanning system, the photo-electric signal receiving circuit in described each module has an analog signal output to be connected with totalizer in addition.At this moment totalizer can be made of operational amplifier.
Certainly, if the analog signal output of each module directly is connected with the input end of micro controller system, also can omit described group id scrambler and totalizer here; But at this moment the input end of micro controller system should be the input end of A/D transducer.
By top description as can be known, use technical scheme of the present invention, whole touch screen can be divided into the less surveyed area of several areas, parallel detection simultaneously, will shorten the cycle that scanning detects screen surface so significantly, thereby increase substantially the response speed of touch-screen.And, because the internal circuit of each parallel detection module is basic identical, as long as what comprise transmits and receives identical can also the exchange of quantity to pipe,, help reducing and manufacture and the maintenance maintenance cost so also can reduce design of touch panel workload and technical difficulty greatly.
Description of drawings
Fig. 1: the synoptic diagram of polaroid installation site on the touch-screen frame;
Fig. 2: infrared emission and reception are to a kind of syndeton synoptic diagram of pipe die group and micro controller system;
Fig. 3: the principle schematic of output of infrared signal receiving unit signal and module coding circuit;
Fig. 4: use universal serial bus to drive the logic theory synoptic diagram of infrared components module.
Specific embodiment
Below in conjunction with accompanying drawing, describe embodiments more of the present invention in detail.
The present invention is divided into plurality of module with infrared emission and reception to the pipe array in orientation, generally be the infrared emission module identical to the quantity of pipe that comprises with reception, and exported the usefulness of detection signal for which group of back identification for its numbering, and the simplest mode is that the circuit structure of module internal is all identical.Use polaroid workplace (surface of emission or receiving plane) front, polarization direction opposite (perpendicular) that is installed in infrared transmitting tube and receiving tube (being referred to as infrared components) array then, stop that adjacent module launches the scattered light of ultrared luminotron simultaneously, to the interference of the receiving tube of this group.In the present invention, the basic mounting structure example of polaroid as shown in Figure 1.Which among the figure, in the inboard of the frame 101 that constitutes touch-screen, be used for the opposite sheet in polarization direction 102,103 being installed on the surface of the window by ultrared filter, can select to be installed on the inside and outside surface according to the requirement in technology, life-span etc.Like this, when the infrared transmitting tube in the adjacent module (is to be driven the identical power valve of serial number under the identical situation of driving circuit, when the number one power valve such as two modules adjacent of the number one in the module) being driven the emission infrared ray simultaneously with the left and right sides, because the polarization direction of polaroid is opposite, so infrared receiving tube can only receive the infrared ray that infrared transmitting tube is launched.Though the polaroid of farther module has the polarization direction identical with this module, since excessive from the angle of axle (departing from optical axis), be not enough to form the photosignal output of enough amplitudes.No matter be touch-screen laterally or vertically, all adopt such structure, just the scan test section territory of touch-screen can be divided into a plurality of little subregions.In the example of Fig. 1, respectively be divided into 4 and 3 modules on the horizontal and vertical direction of touch-screen, whole like this scan test section territory just is partitioned into 12 sub regions 104.Like this, horizontal 4 groups and longitudinally 3 groups scan together, the cycle of scanning a frame so then has only original 1/7, has improved the speed that scanning detects greatly, has shortened the time that detects the touch objects position, has also just improved the response speed of touch-screen.
Match with above-mentioned architectural feature, circuit structure of the present invention as shown in Figures 2 and 3.Fig. 2 a kind ofly uses 6 (D0～D5) is parallel, the bus (parallel address bus is called for short in the back) of the data of the scanning sequency of transmission infrared components comes parallel drive to include the principle assumption diagram of each emitting mould train of 64 infrared componentss at most.The micro controller system 201 of touch-screen is by including the parallel address bus 205 of power supply (Vcc and GND) and clock line (CLK) among the figure, and is in parallel respectively with each input end of the same name of the address decoder 202 of each module; In each module, address decoder again the driver by the infrared transmitting tube array or infrared receiving tube array the gating switch array (for sake of convenience, the back will drive and gating is referred to as driving) 203, drive infrared transmitting tube array or infrared receiving tube array 204.Under address decoder 202 situation identical with driving circuit 203 structures, the address code that transmits corresponding to each address bus 205, the power valve that a same sequence number is all arranged in the different modules is driven the emission infrared ray, so just realized that each module carries out simultaneously and line scanning, thereby realized above-mentioned subarea-scanning pattern.Although the concrete structure of this circuit is varied, all belong to very ripe prior art, can with reference to as exceed explanation at this.
What Fig. 3 provided is when infrared components is infrared receiving tube among Fig. 2, realizes the circuit structure that module is distinguished.Modular circuit among Fig. 3 includes the analog switch driver 301 that drives receiving tube array 302, and Duo a Photoelectric Signal Processing unit 303 than Fig. 2, and the signal of stipulating is exported in this unit when detecting touch objects, as level signal and/or simulating signal.Infrared transmitting tube as long as use the structure of Fig. 2, just can be realized and line scanning when the emission infrared ray; But for receiving unit, detected touch signal output, so output terminal can not be in parallel because need to distinguish which module.The signal output part that solution is each module all is connected with the I/O interface of micro controller system respectively, such advantage is that circuit is simple, therefore signal does not provide in the drawings through to micro controller system, and shortcoming is to take the more I/O mouth line of micro controller system; Another scheme is to add a group id scrambler 305 in micro controller system.Each input end of described group id scrambler 305 is numbered, and is connected with a detection signal output terminal of the Photoelectric Signal Processing unit 303 of each module of being numbered respectively; Its output terminal is connected with the I/O port of micro controller system by parallel bus 306.The output terminal of this group id scrambler includes many parallel binary data lines, when certain input end is imported the signal of regulation, and its output of binary data output terminal and the unique corresponding binary data of this input end.General small-scale logic chip 40147 (10 lines-4 line BCD priority encoder) is a scrambler that can directly use, and perhaps its logic function can be used as an important references of design.
Said structure can have been realized the output of detection signal of digital form and the module identification of output signal, can satisfy the needs of general infrared touch panel.But the photo-electric signal receiving circuit in each module is exported simulating signal if desired, carry out subsequent treatment for micro controller system, as obtaining higher resolution etc. after the A/D conversion, also include a totalizer 304 in the then described parallel scanning system, its output terminal is connected with an A/D conversion input end of micro controller system; Photo-electric signal receiving circuit in described each module has an analog signal output in addition, is connected with the input end of totalizer, and totalizer can be made of operational amplifier.In this structure, which group group id scrambler 305 is used to differentiate has been exported detection signal; Totalizer 304 is then exported the amplitude of photosignal.If but the analog signal output of each module directly is connected with the input end of micro controller system, also can omit described group id scrambler 305 and totalizer 304; But at this moment the input end that is attached thereto of micro controller system all should be the input end with A/D mapping function.
If use Fig. 2 or parallel address bus shown in Figure 3, then the wiring quantity on the circuit board can be many, increases design difficulty.Provided a kind of shift register that uses among Fig. 4 and realized the technical scheme that data are changed between parallel and serial, replaced the more parallel address bus of quantity with a serial data line.With the module that can drive 64 infrared componentss in scheming is example, be with difference main among Fig. 2 or Fig. 3: with the original parallel data that parallel address wire D0～D5 sent, be converted into serial data by going here and there out shift register 401 incorporating into of microcontroller 201 egress bus, and be sent to each module through address bus DATA; SI PO shift register 402 by each module input end is converted into parallel data again, and under the effect of control line EN, (202+303) drives infrared components array 204 by decode/driver 403.
The basic embodiment of realization the object of the invention has been stressed in the front, and the principle and the basic structure of parallel scanning-detecting system have provided a small amount of example that can realize the object of the invention.As complete application technology scheme, can realize and the physical circuit of line scanning detection and the software and hardware structure that microcontroller is worked in coordination with that almost have or not the few techniques scheme under the prior art condition, the enforcement structure of above-mentioned example explanation is not unique.Such as the code structure of the type of drive of the transmission mode of the structural design between polaroid and the infrared absorption filter optical window, address date, infrared components and microcontroller inside and various functions etc., a variety of available technical schemes are arranged all; Even all use little place controller in each module, come more complicated technology scheme of this class of collaborative work by control interface between mutually.Therefore, the improvement of the carrying out on the basis of basic technical scheme of the present invention, transplanting, accommodation, the enforcement of mode such as delete, augment, all belong within the technical scope of the present invention.
Claims (10)
1. parallel scanning system that uses the infrared touch panel of polaroid, include the infrared components that is installed on the printed circuit board (PCB) that constitutes the touch-screen framework, the infrared filtering window that is installed in infrared components light-emitting area and sensitive surface the place ahead, and the driving corresponding with infrared components and signal processing circuit, micro controller system, it is characterized in that:
Described infrared emission and reception are divided into plurality of module to pipe and are numbered, and the identical polaroid in polarization direction all is installed in the infrared filtering window in each module the place ahead; The polarization direction of the polaroid in adjacent two module the place aheads is opposite on the same frame; The address driving circuit of each group infrared transmitting tube and receiving tube is all chosen according to same mode, time and order and is driven each to infrared components, and after the end parallel connection of the same name of the data input pin of its driving circuit, all be connected with the address driving data output terminal of described micro controller system; The signal processing circuit that all includes one infrared receiver component in described each module, and described circuit all has at least one detection signal output terminal, is connected with the I/O interface of micro controller system.
2. parallel scanning system according to claim 1 is characterized in that: described polaroid is installed on the light transmitting surface of infrared absorption filter optical window.
3. parallel scanning system according to claim 1 is characterized in that: the drive output of described micro controller system and the data input pin of described driving circuit are the parallel ports that is connected by many address date lines.
4. parallel scanning system according to claim 1 is characterized in that: the drive output of described micro controller system and the data input pin of described driving circuit are the serial ports that is connected by an address date line.
5. parallel scanning system according to claim 4, it is characterized in that: in the address date output port of described micro controller system, include a shift register of incorporating into/going here and there out, the input end of register is connected with many micro controller I/O port, its output terminal is the drive output of micro controller system, is connected with described address date line; The inside of described driving circuit includes one and seals in/and go out shift register, and its input end is connected with described address date line, and the input end of the decoding circuit in its output terminal and the described driving circuit is connected.
6. parallel scanning system according to claim 1 is characterized in that: also include a group id scrambler in the micro controller system of described formation touch-screen, its output terminal is connected with micro controller I/O interface; The detection signal output terminal of the signal processing circuit of the infrared receiver component in described each module is connected with an input end of described group id scrambler respectively.
7. parallel scanning system according to claim 6 is characterized in that: described group id encoder packet contains some input ends of being numbered, and is corresponding with the numbering of coupled each module of described detection signal output terminal respectively; The output terminal of described group id scrambler includes many parallel binary data lines; When certain input end is imported the signal of regulation, its output of binary data output terminal and the unique corresponding binary data of this input end.
8. parallel scanning system according to claim 6 is characterized in that: also include a totalizer in the described parallel scanning system, its output terminal is connected with an I/O interface of described micro controller system; The signal processing circuit of the infrared receiver component in described each module all has a photosignal output terminal, and an input end of described totalizer is connected.
9. parallel scanning system according to claim 8 is characterized in that: described totalizer is made of operational amplifier.
10. according to claim 1 or 8 described parallel scanning systems, it is characterized in that: the I/O interface that micro controller system is connected with the detection signal output terminal of the signal processing circuit of described infrared receiver component, perhaps the I/O interface that is connected with described totalizer is the input end of A/D transducer.
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| CN2007101753037A CN101398734B (en) | 2007-09-28 | 2007-09-28 | Infrared touch screen parallel scanning system using polarizing disc |
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| CN2007101753037A CN101398734B (en) | 2007-09-28 | 2007-09-28 | Infrared touch screen parallel scanning system using polarizing disc |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2011036337A1 (en) * | 2009-09-23 | 2011-03-31 | Nokia Corporation | Touch detection |
| CN102096499A (en) * | 2009-12-11 | 2011-06-15 | 乐金显示有限公司 | Touch panel and liquid crystal display device including the same |
| WO2011147243A1 (en) * | 2010-05-26 | 2011-12-01 | 汉王科技股份有限公司 | Electromagnetic handwriting apparatus and antenna multi-scan method there of |
| CN103761013A (en) * | 2014-02-17 | 2014-04-30 | 广州市泰奇克光电科技有限公司 | Random skipping type local area detecting locating method for infrared screen |
| CN103777828A (en) * | 2012-10-22 | 2014-05-07 | 速博思股份有限公司 | Touch panel device capable of recombining sensing points and sensing method |
| CN104881183A (en) * | 2015-06-25 | 2015-09-02 | 广州华欣电子科技有限公司 | Signal processing method and MCU |
| CN106293261A (en) * | 2015-05-21 | 2017-01-04 | 青岛海信电器股份有限公司 | A kind of touch screen localization method, device and touch-screen equipment |
| CN107077259A (en) * | 2014-11-24 | 2017-08-18 | 惠普发展公司有限责任合伙企业 | Touch-screen |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US6933991B2 (en) * | 1999-01-22 | 2005-08-23 | White Electronic Designs Corp. | Super bright low reflectance liquid crystal display |
| CN2751317Y (en) * | 2005-08-02 | 2006-01-11 | 北京汇冠新技术有限公司 | Polaroid color filtering frame for suppressing reflection interference in infrared touch screen frame |
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- 2007-09-28 CN CN2007101753037A patent/CN101398734B/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US8310459B2 (en) | 2009-09-23 | 2012-11-13 | Nokia Corporation | Touch detection |
| WO2011036337A1 (en) * | 2009-09-23 | 2011-03-31 | Nokia Corporation | Touch detection |
| CN102096499B (en) * | 2009-12-11 | 2015-07-22 | 乐金显示有限公司 | Touch panel and liquid crystal display device including the same |
| CN102096499A (en) * | 2009-12-11 | 2011-06-15 | 乐金显示有限公司 | Touch panel and liquid crystal display device including the same |
| US9092097B2 (en) | 2009-12-11 | 2015-07-28 | Lg Display Co., Ltd. | Touch panel including each touch controller for each divided region and liquid crystal display device using the same |
| WO2011147243A1 (en) * | 2010-05-26 | 2011-12-01 | 汉王科技股份有限公司 | Electromagnetic handwriting apparatus and antenna multi-scan method there of |
| CN103777828A (en) * | 2012-10-22 | 2014-05-07 | 速博思股份有限公司 | Touch panel device capable of recombining sensing points and sensing method |
| CN103761013A (en) * | 2014-02-17 | 2014-04-30 | 广州市泰奇克光电科技有限公司 | Random skipping type local area detecting locating method for infrared screen |
| CN107077259A (en) * | 2014-11-24 | 2017-08-18 | 惠普发展公司有限责任合伙企业 | Touch-screen |
| CN106293261A (en) * | 2015-05-21 | 2017-01-04 | 青岛海信电器股份有限公司 | A kind of touch screen localization method, device and touch-screen equipment |
| CN106293261B (en) * | 2015-05-21 | 2019-07-12 | 青岛海信电器股份有限公司 | A kind of touch screen localization method, device and touch-screen equipment |
| CN104881183A (en) * | 2015-06-25 | 2015-09-02 | 广州华欣电子科技有限公司 | Signal processing method and MCU |
| CN104881183B (en) * | 2015-06-25 | 2018-03-27 | 广州华欣电子科技有限公司 | A kind of signal processing method and MCU |
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Application publication date: 20090401 Assignee: Beijing Irtouch Systems Co.,Ltd. Assignor: Beijing UNITOP New Technology Co., Ltd. Contract record no.: 2012110000118 Denomination of invention: Infrared touch screen parallel scanning system using polarizing disc Granted publication date: 20101215 License type: Exclusive License Record date: 20120717 |
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